Sonic and Tails are back for another adventure as they again battle the evil Dr. Eggman (AKA Dr. Robotnik), who is desperately trying to collect all the Chaos Emeralds in order to rebuild his Death Egg. Our heroes must find the Chaos Emeralds before Dr. Eggman does, but winning the race won't be easy -- a new adversary, Knuckles the Echidna, has arrived on the scene and will do whatever he can to keep Sonic and Tails from reaching their goal. Swing from vines, launch new attacks, survive deadly traps and summon Tails to airlift Sonic out of danger. Discover hidden rooms and passageways in the mega-sized Zones. Transform into Super Sonic and experience the ultimate in speed and ultra-sonic power.